James shepherd



' ,J. SHEPHERD.

Patented Oct. 14, 1884.

ME TATES JAMES SHEPHERD, OF MANCHESTER, COUNTY OF LANCASTER, ENGLAND.

PULLEY OR DRUM.

:fiPEGIPIGATION forming part of Letters Patent No. 306,538, datedOctober 14, 1884.

Application filed August 19, 1884. (N0 model.) Patented in EnglandFebruary 2B, 1814, No. 3,932.

To all whom it may concern.-

Be it known that I, JAMES SHEPHERD, a subject of the Queen of GreatBritain, residing at Manchester, in the county of Lancaster, England,have invented new and useful Improvements in Pulleys and Drums forDriving Purposes, of which the following is a specification.

'Ioincrease the efficiency of pulleys for turning purposes, and toobtain close contact between the face of the pulley (whether ofcastiron, wrought-iron, steel, or other material) and the strap or beltrunning over it, I perforate the face or periphery of the pulley withholes or slots varying in size and number according to the size ordiameter of the pulley and the width of the strap or belt to be used orfine slots or channels may be out across the face of the pulley inparallel or diagonal or circumferential lines; or the periphery may beformed of a number of narrow rings, leaving a small space between each.7

The primary object of the invention is to enable the film of air that iscarried in between the face or inside surface of the strap or belt andthe outer face or surface of the pulley when running to be easilyexpelled, whereby closer contact between the two is obtained, the faultof slipping is reduced and the regularity and power of the turning isimproved.

In order that the invention may be fully understood, I will, by the aidof the accompanying drawings, proceed to describe means pursued by me incarrying the same into effect.

Figure 1 shows the outer surface of an ordinary pulley in elevation,with holes through the periphery of the pulley. These holes are variedin size, number, and order of distribution according to the size andcharacter of the pulley. Figs. 2 and 3 are elevations of a sin1ilarpulley.

The periphery or outer face of No. 2 is crossed by a series of parallelgrooves or channels Varying in number, width, and depth according to thesize and character of the pulley; or these grooves or channels may becrossed in a diagonal or circumferential direction. The periphery of N0. 3 is composed of a series of narrow rings with a small open spacebetween each. The primary object in each case is to allow of the rapidescape of air that is carried in between the face of the pulley and theinner surface of the band or strap when running.

Having thus described my improvements and the means that I adopt incarrying the same into effect, I would have it understood that I do notconfine myself to the exact details shown and described, as variationsmay be made in them without departing from the peculiar character of myinvention but What I do claim is A pulley or drum having its face orperiphery perforated, spaced, grooved, or fluted to form exit-passagesfor the air that is taken in between the outer face of the pulley andthe strap or band when running.

JAMES SHEPHERD.

WVitnesses:

J. G. COOHRANE, 40 Tipping St, .Ardwick.

JOHN BATTEY, 22 Thomas St, Ardwick, lllanchester.

